Heat exchange unit



FIG. 1 is a front view of my new heat exchange unit;

FIG. 2 is a rear view thereof;

FIG. 3 is a plan view thereof;

FIG. 4 is a bottom view thereof;

FIG. 5 is a left side view thereof;

FIG. 6 is a right side view thereof;

FIG. 7 is an enlarged view of a portion of the heat exchange unit cut away at line A—A′ of FIG. 1; and,

FIG. 8 is an enlarged sectional view of the heat exchange unit cut away along line B—B′ of FIG. 7 thereof. 

The ornamental design for a heat exchange unit, as shown and described. 